By considering that the \(\sim 2.6~M_{\odot }\)  compact star had been rotating at its mass-shedding limit, possible constraints can be extracted for the corresponding equatorial radius. The kerr parameter at the mass-shedding limit can be expressed as a relation with the gravitational mass, and hereafter a region of \(\mathcal {K}_{\rm max} = [0.67,0.69]\)  is extracted. This region also includes the upper limit of the relevant region from Ref. [1]} in a narrow range. In addition, using a relation that connects the kerr parameter and the compactness parameter at its mass-shedding limit, a possible tight region for the equatorial radius of the star is implied as \(R_{\rm max} = [14.77,14.87]~{\rm km}\) .
